// Copyright 2021 The TensorFlow Runtime Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// RUN: tfrt_opt -canonicalize --split-input-file %s | FileCheck %s -dump-input=fail

// CHECK-LABEL: @main
func.func @main(%ch: !tfrt.chain) -> (!tfrt.chain, !tfrt.chain) {
  // CHECK-NOT: tfrt.merge.chains
  %out = tfrt.merge.chains %ch : !tfrt.chain
  tfrt.return %out, %ch : !tfrt.chain, !tfrt.chain
}

// -----

// CHECK-LABEL: @main
func.func @main(%ch: !tfrt.chain) -> (!tfrt.chain) {
  // CHECK: tfrt.merge.chains
  %out = tfrt.merge.chains %ch : !tfrt.chain
  tfrt.return %out : !tfrt.chain
}
